Probable transcription factor required for the initiation of inflorescence trichomes in response to gibberellin (GA). Acts upstream of GIS, GIS2, ZFP8 and the trichome initiation regulators GL1 and GL3 (PubMed:21803862, PubMed:22301962). Binds the promoter region of ZFP8, which may be a direct target of ZPF5 (PubMed:21803862). Is not involved in the regulation of trichome branching (PubMed:22301962). Modulates root hair initiation and elongation in response to cytokinin and ethylene signals by directly promoting expression of the CAPRICE (CPC) gene (PubMed:22762888). {ECO:0000269|PubMed:21803862, ECO:0000269|PubMed:22301962, ECO:0000269|PubMed:22762888}.